Construction of transmission mechanism.



T. B. MURRAY. CONSTRUCTION 0F TRANSMISSION MECHANISM.

APPLICATION FILED MAR. 8. 1917.

Patented Aug. 21, 1917.

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T. B. MURRAY.

CONSTRUCTION 0F TRANSMISSION NIECHANISNI. APPLICATION man 1111111.12. 1917.

1,238,044; Patented Ang. 21, 1917.1,

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CNSTRUCTIGN OF TRANSMISSION MECHAIIISM( To all whom t may concern:

Be ltknown that l, THeMAs BLAoxWoOD `MURRAY, 13.80.-, M.. Inst. C. E.,a subject of the King` ofv Great Britain and lreland, and

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Vprincipally intended for use a kresident of Seotstoun, in the county of Renfrew., Scotland, have invented certain new and useful Improveinentsin Construction of.v Transmission Mechanism, and of which the following is Vthe specification.

The invention" relates to live back axles in heavy commercial vehicles," and of the type in which there is' a 'final train of reduction gearing, and has forits object to provide a robust` and simple'structure readily accessible.

In carrying out the invention. the body of the axle is of Well known ring type, the axle proper' consistingof a single forging having tvvo tubes'extending laterally from` a central annular portion. `According to the first part of the invention -thereis forced into each of the inner and enlarged openingsof the tubes within the annulus a sleeve. 'Or these sleeves may be made 1n a piecev with the tubes. `R-igidly mounted on these sleeves areL `the inner racesof two 'ballor roller bearings,fthe outer races 'of Which carry the pinions of theiinalidrive. These pinions 'are"belled` to receive the *bearings and the' inner ends of the sleeves,y and 1 havey bosses projectingvvithin the sleeves for their attachment to the driving shafts flyingvvithin the tubes.

The axleis arrangedwith theplaneof its annulus horizontal, and a semiespheroidal inelosing case provided With `the 4usual lubrication arrangements is bolted beneath" it. To the upper face of the annulus is bolted an annular case. Closing the upper end of this is a second spheroidal case-pro vided with housings for the rear end of the propeller shaft and with. axial bearings for the intermediate and diiferential shaft which liesparallel with, and above the axle proper.

The differential ygear carried on this shaft 'with the pinions` gearing with the final pin ions on the internalaxle shaftsconsists of a single piece centralinernberhaving laterally extending stub axles or trunnions forming the dilferential' shaft. `The planetary pinions are received in f apertures formed lthrough the member and are fsecured therein by a pivot pin. "The bevel wheel engaged by the bevel pinion of the propeller shaft is bolted directly to the een f yspeculation of vLetters raient.

'Applcationled March 8,1917.. Seralll'o. 153,506.1 I

tral member. The kcentral pinions of thev differential'y gear are on sleeves on the stub differential shaft, and on these sleeves are' also the pinions transmittingto the axleshafts. End thrust of the differential bevel Patentedy dug.; 2l, will.'

pinions isv taken between the sleeves and collars on the stub shaft and is thus entirely self-contained-moreover a certain amount of frictional restraint at this point is well-known te be of advantage. The stub diderential shaft With the sleeves thereon 1s4 supported upon ball or roller bearings in` the upper *spheroidal easing-end thrust bearings being also provided to take the thrust of the propeller shaft pinion.

An example of an axle embodying the features set forth is shown in sectional rear elevation in Figure l and in sectional side elevation in Figpl on two accompanying sheets of explanatory drawings.

ln this example there are forced into the inner ends of the usual tubes A ofthe axle, sleeves B. Mounted on the inner ends of these sleeves B are the inner races of ball bearings() the outer races of which engage flanges l) on the belled pinions E of the final drive,` which pinions are of course vupon the `inner endsof the usual drivin;

shafts l?. The axle tubes A. are extensions of the ring forging .Gr forming the central. portion of the axle.. A semi-spheroidal case H provided with usual lubricating arrangements is secured beneath this forging, and above it is secured a more or less annular case J 'provided With a housing L for the rear end of the propeller shaft M. Bolted tothe annular ease J is a second spheroidal case K with axial bearings N for the intermediate and differential shaft which lies parallel vvithand above the axle proper.

vThe difierential gear, consists of a singlepiece central-member G having laterally extending stub-axles P which form the dierential shaft. @n the axles P are loosely mounted sleeves Q on which are formed pin `ions R of the final reduction train and which gear With thefinaldrive pinions E. On the U passing therethrough.

The bevel Wheel V by which the drive is transmitted from the bevel pinion W on the end of the propeller shaft yMis bolted direetly tol tht-y rneniber O. The propeller lili lio

vshaft is provided with journal and thrust` bearings as are also the stub shafts P.

What I claim is:

l. Transmission mechanism comprising a tubularaxle 'and a central annularfforging integral therewith, sleeves, projecting from the tubular portions of the axle into the area of said central annular portion, bear ing devices on said sleeves, shafts extending through said tubular portions and sleeves, toothed wheels on the inner ends of said shafts, said wheels being belled to engage said bearings, a differential shaft and pinions 'thereon gearing with said toothed wheels, in combination with casings supported'by and' inclosing the 'annularvportion through said tubular portions and sleeves, toothed wheels on the inner ends of said shafts, Asaid wheels being belled to engagev .said bearings, a differential gear' device- -on the sleeves, together with a casing supported by and inclosing the annular portion of the axle and supportingand inclosing said differential shaft, the stub axles of the one piece member of the differential having .their bearings in said casing, substantially as described.

In testimony whereof I have signed my name to -this specilication, in the presence of two subscribing witnesses.

'THOMAS BLAeKWooD MURRAY.

Witnesses:

DAVID FERGUSON, JAMES EAcLEsoM. 

